danielle nottingham cbs 5. >>> president obama has a warning for syria's government. go after your people with chemical weapons and you will face serious consequences. >> the word is watching. the use of chemical weapons is and would be totally unacceptable. and if you make the tragic mistake of using these weapons, there will be consequences and you will be held accountable. >> u.s. intelligence suggests the assad regime may be planning sarin gas attacks against rebel forces. the lethal nerve agent is 500 times deadlier than cyanide. the syrian foreign ministry denies the reports. >>> a highway tunnel that collapsed and killed nine people in japan over the weekend reportedly passed safety checks just a few months ago. several cars were crushed when a section of concrete longer than a football field came crashing down sunday in the tunnel west of tokyo. inspectors believe loose bolts may be to blame. japan has now ordered emergency inspections of highway tunnels across the country. >>> two mexican nationals have been charge with killing a u.s. coast guards man. they h